I got a call this morning from that number and after seeing your post I decided to let my dog answer it. It was quite an interesting conversation. Lots of barking, whining, growling, yipping, panting and other sounds I don't have a name for. I'm now confident there's a 3 letter agency involved and I suspect they just recruited my dog. Now my dog does nothing all day but watch me, except from time to time when he looks past me like there's someone or something behind me, but when I turn around it's gone. I'm getting creeped out.